CN108265559B - Method for improving paper strength and paper - Google Patents
Method for improving paper strength and paper Download PDFInfo
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- CN108265559B CN108265559B CN201810020737.8A CN201810020737A CN108265559B CN 108265559 B CN108265559 B CN 108265559B CN 201810020737 A CN201810020737 A CN 201810020737A CN 108265559 B CN108265559 B CN 108265559B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
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Abstract
The invention discloses a method for improving paper strengthThe method comprises the steps of preparing 60-96 parts by weight of raw material slurry; adding 0.8-1.3 parts by weight of starch into the raw material slurry; continuously adding 3-38 parts by weight of mixed filling slurry into the raw material slurry, wherein the mixed filling slurry is a mixture of the filling slurry and the auxiliary slurry; adding 3.1 x 10 to the original material slurry‑4～3.5*10‑4And (5) reserving the auxiliary agent by weight, completing pulp preparation and sheet making treatment, and preparing the paper. According to the invention, the mixed filling pulp added with the auxiliary pulp is used for replacing the original filling pulp, so that the strength of the prepared paper is higher, the ash content is higher, the fiber consumption is saved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for improving paper strength and paper.
Background
In the existing papermaking process, the filler is added, namely solid particles which are not easy to dissolve in water are added into paper pulp to improve the opacity, brightness, smoothness, printing adaptability, softness, uniformity and size stability of paper, the paper can also have better hand feeling, lower hygroscopicity and less fiber consumption, so that the paper is easier to dehydrate and dry, the energy consumption is less and the manufacturing cost is lower.
The inventor of the application finds that the current method for pretreating the filler can be used for manufacturing paper by adding the filler modifier and then adding the filler fixing agent for mixed transportation. However, this method has many additional steps and is complicated. In other methods, only increasing the ash content of the paper is a concern, which affects the quality of the paper.
Disclosure of Invention
The invention provides a method for improving paper strength and paper, and aims to solve the technical problems that paper ash content is improved, paper quality is affected and a process flow is complex in the prior art.
In order to solve the technical problems, one technical scheme adopted by the invention is to provide a method for improving the strength of paper, which comprises the following steps:
preparing 60-96 parts by weight of raw material slurry;
adding 0.8-1.3 parts by weight of starch into the raw material slurry;
continuously adding 3-38 parts by weight of mixed filling slurry into the raw material slurry, wherein the mixed filling slurry is a mixture of the filling slurry and the auxiliary slurry;
adding 3.1 x 10 to the raw material slurry-4～3.5*10-4And (5) reserving the auxiliary agent by weight, completing pulp preparation and sheet making treatment, and preparing the paper.
In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a paper, including:
60-96 parts by weight of raw material slurry, 0.8-1.3 parts by weight of starch, 3-38 parts by weight of mixed filling slurry and 3.1 x 10 parts by weight of starch-4～3.5*10-4And (3) retaining auxiliary agent in parts by weight, wherein the mixed filling slurry is a mixture of filling slurry and auxiliary slurry.
According to the invention, the mixed filling pulp added with the auxiliary pulp is used for replacing the original filling pulp, so that the strength of the prepared paper is higher, the ash content is higher, the fiber consumption is saved, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic flow chart of one embodiment of a method of increasing sheet strength according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of the method of increasing sheet strength of the present invention;
FIG. 3 is an enlarged schematic view of a prior art fill slurry;
FIG. 4 is a schematic diagram of a method of mixing the filler slurry according to another embodiment of the method of improving paper strength according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, one embodiment of the method for improving paper strength of the present invention comprises:
s101, preparing 60-96 parts by weight of raw material slurry;
in this example, the raw material Pulp included 50% to 90% Alkaline Peroxide Mechanical Pulp (APMP) and 10% to 50% Bleached Kraft hardwood Pulp (LBKP, Laubh ǒ lxer Bleached Kraft Pulp). Wherein, the raw material of the alkaline peroxide mechanical pulp can be eucalyptus, acacia wood, poplar or the mixture of at least two kinds of wood.
S102, adding 0.8-1.3 parts by weight of starch into the raw material slurry;
in this example, the starch is a cationic starch. In other embodiments, other chemicals having an enhancing effect, such as dry strength agents, may be substituted for the starch.
S103, continuously adding 3-38 parts by weight of mixed filling slurry into the raw material slurry;
in this embodiment, the mixed filling slurry is a mixture of the filling slurry and the auxiliary slurry; wherein the filling slurry is Ground Calcium Carbonate (GCC), and the grade of the Ground Calcium Carbonate is C52-C58. The auxiliary pulp is prepared by reprocessing auxiliary raw material pulp, wherein the auxiliary raw material pulp is alkaline peroxide mechanical pulp, and the auxiliary pulp is alkaline peroxide mechanical pulp fine fibers.
S104, continuously adding 3.1 x 10 into the raw material slurry-4～3.5*10-4Reserving the auxiliary agent by weight, completing pulp preparation and sheet making treatment,and (5) making paper.
In this embodiment, the retention aid may be a cationic polyacrylamide.
According to the embodiment of the invention, the mixed filling pulp added with the auxiliary pulp is used for replacing the original filling pulp, so that the strength of the prepared paper is higher, the ash content is higher, the fiber consumption is saved, and the cost is reduced.
Referring to fig. 2, another embodiment of the method of the present invention for increasing the strength of paper comprises:
s201, preparing 60-96 parts by weight of raw material slurry;
in this example, the raw material Pulp includes 50% to 90% Alkaline Peroxide Mechanical Pulp (APMP) and 10% to 50% Bleached sulfate hardwood Pulp (LBKP, Laubh ǒ lxer Bleached Kraft Pulp), for example, 50% Alkaline Peroxide Mechanical Pulp and 50% Bleached sulfate hardwood Pulp, 70% Alkaline Peroxide Mechanical Pulp and 30% Bleached sulfate hardwood Pulp, 90% Alkaline Peroxide Mechanical Pulp and 10% Bleached sulfate hardwood Pulp. Wherein, the raw material of the alkaline peroxide mechanical pulp is a mixture of eucalyptus and acacia wood mixed in a ratio of 8: 2. In other embodiments, the raw material of the alkaline peroxide mechanical pulp may also be eucalyptus, acacia, poplar, or a mixture of at least two woods thereof.
S202, adding 0.8-1.3 parts by weight of starch into the raw materials;
in this example, the starch is a cationic starch. For example, 0.8, 1 or 1.3 parts by weight of starch may be added to the raw material.
S2031, respectively preparing filling slurry and auxiliary raw material slurry, and sieving the auxiliary raw material slurry;
in this example, the filler slurry was ground calcium carbonate having a grade of C52-C58. The auxiliary raw wood pulp comprises alkaline peroxide mechanical pulp made of 75-85% eucalyptus and alkaline peroxide mechanical pulp made of 15-25% acacia wood, for example a mixture of alkaline peroxide mechanical pulp made of 75% eucalyptus and alkaline peroxide mechanical pulp made of 25% acacia wood, a mixture of alkaline peroxide mechanical pulp made of 70% eucalyptus and alkaline peroxide mechanical pulp made of 30% acacia wood, and a mixture of alkaline peroxide mechanical pulp made of 85% eucalyptus and alkaline peroxide mechanical pulp made of 15% acacia wood.
In this embodiment, the auxiliary raw material slurry may be sieved by a sieve of 80 to 120 meshes, for example, a sieve of 80 meshes, 100 meshes or 120 meshes, and the sieved auxiliary raw material slurry is retained.
S2032, grinding the screened auxiliary raw material pulp to obtain auxiliary pulp;
in this example, the screened secondary raw material pulp may be refined 4 x 10 with a PFI refiner (vertical refiner)4～8*104Rotor (e.g. 4 x 10)4Turn, 6 x 104Trans or 8 x 104And rotating) to obtain auxiliary pulp, wherein the auxiliary pulp is alkaline peroxide mechanical pulp fine fiber, and the freeness of the auxiliary pulp is 40-60 ml (such as 40ml, 50ml or 60 ml).
S2033, uniformly mixing the auxiliary slurry and the filling slurry to obtain mixed filling slurry;
in the embodiment, the auxiliary slurry and the filling slurry are mixed according to a ratio of 1: 12-2: 1 (such as 1:12, 1:1 or 2:1), and stirred at a speed of 600-800 r/min (such as 600r/min, 700r/min or 800r/min) for 8-12 seconds (such as 8 seconds, 10 seconds or 12 seconds), so that the auxiliary slurry and the filling slurry are fully mixed and uniformly dispersed to obtain a mixed filling slurry;
s204, continuously adding 3-38 parts by weight of mixed filling slurry into the raw material slurry;
s205, adding 3.1 x 10 to the original material slurry-4～3.5*10-4And (5) reserving the auxiliary agent by weight, completing pulp preparation and sheet making treatment, and preparing the paper.
In this embodiment, the retention aid may be a cationic polyacrylamide.
Referring to table 1, the addition amount of the filling slurry was 3%, and the addition amounts of the auxiliary slurries were 0.0%, 2.5%, and 5.0%, respectively, as reference groups; the addition amounts of the filling slurry are respectively 8 percent, 13 percent and 18 percent33%, and the additive amounts of the auxiliary slurries were 0.0%, 2.5%, and 5.0%, respectively, and compared with each other as a comparative group. Wherein the raw material pulp is a mixture of 85% of alkaline peroxide mechanical pulp and 15% of bleached sulfate hardwood pulp; the quantitative of the sheet making is 120 plus or minus 2g/m2。
As can be seen from table 1, the improvement effect of the addition of the auxiliary slurry on the cohesive force is significant. For example, in the reference group, the paper filler size No. 1 was added in an amount of 3%, the auxiliary size was added in an amount of 0.0%, and the cohesive force was 144J/m2(ii) a The paper filler size No. 3 was added in an amount of 3%, the auxiliary size was added in an amount of 5.0%, and the cohesive force was 172J/m2The cohesion of the paper was improved by 19.4% as compared with that of No. 1. TABLE 1
It can also be seen from table 1 that the addition of the mixed filler slurry provides a significant increase in paper ash with the same or similar paper strength qualities, i.e., the same or similar cohesion, while also providing a saving in paper costs. For example, in control 1, the paper filler size No. 4 (i.e., ground calcium carbonate) was added in an amount of 8%, the auxiliary size was added in an amount of 0.0%, and the cohesive force was 140J/m2Ash content is 6.1 +/-0.1%; in control 2, the paper filler size No. 8 was added in an amount of 13%, the auxiliary size was added in an amount of 2.5%, and the cohesive force was 139J/m2The ash content is 8.8 +/-0.2 percent, which is improved by about 2.7 percent compared with the ash content of paper with the serial number 4; in control 3, the paper filler size No. 12 was added in an amount of 18%, the auxiliary size was added in an amount of 5.0%, and the cohesive force was 139J/m2The ash content was 12.4. + -. 0.2%, which is about 6.3% higher than that of the paper ash content of No. 4 and about 3.6% higher than that of the paper ash content of No. 8. Wherein, compared with the paper with serial number 4, the original material pulp unit price of the paper with serial number 12 is converted into 3450 yuan/t pulp (yuan/ton pulp), and the grinding calcium carbonate unit price is converted into 500 yuan/t pulp, so the paper unit price can save (3450-. In other embodiments, the raw stock of paper is 60% alkaline peroxideA mixture of mechanical pulp and 40% bleached kraft hardwood pulp at a fill stock add-on of 10% to give a paper sheet with a cohesion of 160J/m2Ash content 6.5%; the paper has raw material pulp of 60% alkaline peroxide mechanical pulp and 40% bleached sulfate hardwood pulp, filler pulp of 25% and auxiliary pulp of 5%, and the obtained paper has cohesive force of 163J/m2Ash content 14%; the raw material pulp unit price of the paper is converted into 3700 yuan/t pulp, and the grinding calcium carbonate unit price is converted into 500 yuan/t pulp, so that the paper unit price can be saved by (3700 and 500) × (14% -6.5%) -240 yuan/t pulp.
Referring to Table 2, FIG. 3 and FIG. 4, the auxiliary raw material pulp, i.e., APMP, had a fiber length of 0.54Ln/mm, a fiber width of 19.33 μm, a fine fiber content of 29.41%, a kink index of 223.43l/m, and a crimp rate of 7.51%. The auxiliary pulp is obtained after sieving and pulping, namely the APMP fine fiber has the fiber length of 0.32Ln/mm, the fiber width of 17.19 mu m, the fine fiber content of 70.76 percent, the kink index of 103.94l/m and the crimp rate of 8.57 percent. FIG. 3 is an enlarged schematic view of a prior art filling slurry, i.e., 100% ground calcium carbonate stock solution, with a general adhesion, resulting in a general cohesion of the finished paper. Fig. 4 is an enlarged schematic view of a mixed filling slurry containing 15% ground calcium carbonate and 2.5% APMP fines, which has better adhesion and can improve retention and paper cohesion.
TABLE 2
According to the embodiment of the invention, the mixed filling pulp added with the auxiliary pulp is used for replacing the original filling pulp, so that the strength of the prepared paper is higher, the ash content is higher, the fiber consumption is saved, and the cost is reduced.
The paper comprises 60-96 parts by weight of raw material pulp, 0.8-1.3 parts by weight of starch, 3-38 parts by weight of mixed filling pulp and 3.1 x 10-4～3.5*10-4Parts by weight of retention aids, whichThe mixed filling slurry is a mixture of a filling slurry and an auxiliary slurry.
According to the embodiment of the invention, the mixed filling pulp added with the auxiliary pulp is used for replacing the original filling pulp, so that the strength of the prepared paper is higher, the ash content is higher, the fiber consumption is saved, and the cost is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A method of increasing the strength of paper comprising:
preparing 60-96 parts by weight of raw material slurry;
adding 0.8-1.3 parts by weight of starch into the raw material slurry;
continuously adding 3-38 parts by weight of mixed filling slurry into the raw material slurry, wherein the mixed filling slurry is a mixture of the filling slurry and the auxiliary slurry;
adding 3.1 x 10 to the raw material slurry-4～3.5*10-4The auxiliary agent is reserved according to the weight part, pulp preparation and sheet making treatment are completed, and paper is made;
the preparation method of the mixed filling slurry specifically comprises the following steps:
respectively preparing filling slurry and auxiliary raw material slurry, and sieving the auxiliary raw material slurry;
grinding the screened auxiliary raw material pulp to obtain auxiliary pulp;
uniformly mixing the auxiliary slurry and the filling slurry to obtain mixed filling slurry;
the method for uniformly mixing the auxiliary slurry and the filling slurry specifically comprises the following steps:
mixing the auxiliary slurry and the filling slurry according to a ratio of 1: 12-2: 1, and stirring at a speed of 600-800 r/min for 8-12 seconds to fully mix and disperse the auxiliary slurry and the filling slurry uniformly to obtain mixed filling slurry;
the raw material pulp comprises 50-90% of alkaline peroxide mechanical pulp and 10-50% of bleached sulfate hardwood pulp;
the auxiliary raw material pulp comprises 75-85% of alkaline peroxide mechanical pulp made of eucalyptus and 15-25% of alkaline peroxide mechanical pulp made of acacia wood.
2. The method according to claim 1, wherein the method of screening the secondary raw material slurry comprises:
and sieving the auxiliary raw material slurry by using a sieve of 80-120 meshes, and retaining the sieved auxiliary raw material slurry.
3. The method according to claim 1, wherein refining the screened secondary raw material slurry comprises:
refining the sieved auxiliary raw material pulp by a PFI refiner 4 x 104～8*104And (4) obtaining auxiliary slurry, wherein the freeness of the auxiliary slurry is 40-60 ml.
4. The method of claim 1,
the filling slurry is ground calcium carbonate, and the grade of the ground calcium carbonate is C52-C58.
5. The method of claim 1,
the retention aid is cationic polyacrylamide.
6. A paper sheet, comprising:
60-96 parts by weight of raw material slurry, 0.8-1.3 parts by weight of starch, 3-38 parts by weight of mixed filling slurry and 3.1 x 10 parts by weight of starch-4～3.5*10-4Parts by weight of a retention aid, wherein the mixed filler slurryThe auxiliary raw material pulp is a mixture of auxiliary pulp and filling pulp which are mixed according to the proportion of 1: 12-2: 1, the raw material pulp comprises 50-90% of alkaline peroxide mechanical pulp and 10-50% of bleached sulfate hardwood pulp, the auxiliary pulp is obtained by sieving and grinding the auxiliary raw material pulp, and the auxiliary raw material pulp comprises 75-85% of alkaline peroxide mechanical pulp made of eucalyptus and 15-25% of alkaline peroxide mechanical pulp made of acacia wood.
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| CN110733280A (en) * | 2019-09-29 | 2020-01-31 | 高邮市卫星卷烟材料有限公司 | gold stamping paper with strong compressive strength and preparation method thereof |
| CN114687250A (en) * | 2022-02-11 | 2022-07-01 | 广西金桂浆纸业有限公司 | Paper and processing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6156118A (en) * | 1997-11-21 | 2000-12-05 | Metsa-Serla Corporation | Filler for use in paper manufacture and method for producing it |
| CN104480777A (en) * | 2014-11-13 | 2015-04-01 | 金华盛纸业（苏州工业园区）有限公司 | Wallpaper base paper and production method thereof |
| CN104594116A (en) * | 2014-12-22 | 2015-05-06 | 金东纸业（江苏）股份有限公司 | Composite filler and preparation method thereof as well as pulp and paper applying the composite filler |
| CN106638123A (en) * | 2016-12-30 | 2017-05-10 | 芜湖市哈贝纸业有限公司 | Composite filler paper and production process thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6156118A (en) * | 1997-11-21 | 2000-12-05 | Metsa-Serla Corporation | Filler for use in paper manufacture and method for producing it |
| CN104480777A (en) * | 2014-11-13 | 2015-04-01 | 金华盛纸业（苏州工业园区）有限公司 | Wallpaper base paper and production method thereof |
| CN104594116A (en) * | 2014-12-22 | 2015-05-06 | 金东纸业（江苏）股份有限公司 | Composite filler and preparation method thereof as well as pulp and paper applying the composite filler |
| CN106638123A (en) * | 2016-12-30 | 2017-05-10 | 芜湖市哈贝纸业有限公司 | Composite filler paper and production process thereof |
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